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If the sides a, b, c of a triangle are i...

If the sides a, b, c of a triangle are in G..P. and largest angle exceeds the smallest by `60^(@)`, then `cos B `=

A

1

B

`(sqrt(13) - 1)/4 `

C

`1/2`

D

`(1- sqrt13)/4`

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-PROPERTIES OF TRIANGLES-LECTURE SHEET EXERCISE - I ( Straight Objective Type Questions )
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  2. The sides of a triangle are the consecutive natural number and its lar...

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  3. If the sides a, b, c of a triangle are in G..P. and largest angle exce...

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  4. If in a triangle ABC sines of angles A and B satisfy the equation 4x^(...

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  5. If (sin 3B)/(sinB)=((a^(2)-c^(2))/(2ac)) then a^(2),b^(2),c^(2) are in

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  7. In triangle ABC, AD and BE are the medians drawn through the angular p...

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  9. In DeltaABC, AD is the altitude from A, if b gt c, C=23^(0), AD=(abc)/...

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  10. The base of a triangle is divided into 3-equal part. If t(1), t(2), t(...

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  11. If O is the point inside the triangle ABC such that lfloor OBC = A//2,...

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  12. In a triangle ABC, a similar triangle A'B'C' is inscribed so that B'C'...

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  14. In Delta ABC , " if " angle C = 3 angle A, BC = 27 , and AB = 48. The...

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  15. In a triangle ABC, if A,B, C are in A.P and b:c =sqrt3:sqrt2, then

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  16. In Delta ABC, if cos A cos B+ sin A sin B sin C=1, then a:b:c=

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  18. Which of the following does not exist ?

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  19. If the angles A, B and C of a triangle are in an arithmetic progressio...

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